<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>[===]</title>
		<script>
			//=== ？恒等于
			var a="6",b=6;
			alert(a==b);
			alert(a===b);
		</script>
	</head>
	<body>
	</body>
</html>
